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cork of the distilling vessel. It serves to agitate the liquid
by introducing a stream of fine air-bubbles which keep it
in constant motion. When the water is removed as far
as possible, the residue, which forms, on cooling, a thick
viscid mass, is mixed with 500 c.c. absolute alcohol. It is
heated on the water-bath with reflux condenser for a short time
with the addition of a little animal charcoal and filtered. The
alcoholic solution is cooled in ice and saturated with dry
hydrogen chloride (see p. 93). The liquid is then boiled for

FIG. 66.
half an hour on the water bath, cooled, and, after dropping in a
crystal of the substance, left overnight. Glycocoll ester hydro-
chloride crystallises in colourless needles (m. p. 144) and is
filtered and washed with a little alcohol. Yield 1015 grams.
Diazoacetic Ester,    |    \N
Curtius, /. prakt. Chem.,  1888, 38, 401 ; Siiberrad,  Trans.
Chem. Sac., 1902, 81, 600.
25 grams glycocoll ester hydrochrloride (in 50 c.c. of water).
18      ,,      sodium nitrite in fine powder.